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Suspected illegal immigrants climbing from the back of a truck (Image: UGC TMS)

Mr Stanley said: "I pulled across into the same lane as the French lorries that were carrying goods for what looked like an industrial project.

"There are no cameras there. One lorry stopped, the crate was opened and [they] all came piling out.

"There were about 30 or 40 [people], minimum. I was shocked."

The incident happened the day before a House of Lords inquiry found that the EU's Operation Sophia, which tackles people-smuggling in the Mediterranean, had failed to stop migrants from making the journey.